Lifetimes of anion vacancies and F 2 + color centers in lithium fluoride following irradiation

Войтович, А. П.; Калинов, В. С.; Naumenko, N. N.; Runets, L. P.; Stupak, A. P.

doi:10.1007/s10812-010-9322-8

J Appl Spectrosc

2010

DOI: 10.1007/s10812-010-9322-8

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Lifetimes of anion vacancies and F 2 + color centers in lithium fluoride following irradiation

А. П. Войтович

В. С. Калинов

N. N. Naumenko

et al.

Abstract: A method is developed for determining the mean lifetime of anion vacancies in dielectric crystals following irradiation. This method is used to study the temporal kinetics of the concentrations of vacancies and F 2 + color centers in lithium fluoride crystals irradiated by ionizing radiation. It is then possible to study the dependences of the vacancy lifetime on the concentration of F 1 color centers, temperature, and impurity content of a crystal. Vacancy and F 2 + color lifetimes determined by this method a… Show more

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“…Samples and Study Technique. It was shown earlier [18] that the conditions imposed on irradiation of crystals intended for studying color center aggregation processes in the post-radiation period are quite well satisfied if the samples are irradiated by gamma photons at a temperature T irrad that is lower than the temperature T v of vacancy mobility. Accordingly, all the samples were irradiated by γ photons from a 60 Co source at liquid nitrogen temperature, T irrad = 77 K. The irradiation temperature was below the V k center and vacancy mobility temperatures, so that these defects were localized during irradiation.…”

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Aggregate color center formation processes in lithium fluoride crystals after irradiation

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Lithium fluoride crystals were irradiated by different doses of gamma photons at a temperature of 77 K. We measured the aggregation kinetics for the color centers with different annealing temperatures above the temperature of anion vacancy mobility. We show that the lifetimes of the vacancies decrease while the lifetimes of the F 2 + centers increase as the irradiation dose increases. We explain these types of dependences based on the aggregation processes for color centers in the post-radiation period. We determine the time constants and energies (analogous to activation energies in the Arrhenius equation) for the various processes involving rise and fall in the concentration of aggregate color centers. Based on the experimental data obtained, we have established the processes forming F 2 and F 3 + centers in the post-radiation period. The F 2 centers are formed when vacancies v a add to F 1 − centers. Vacancies arising during irradiation of the crystal participate in their creation in the first fast stage. In the long final stage, vacancies are used which appear in the post-radiation period on occurrence of the reaction F 2 + + H → v a + fluoride ion at the lattice site, where H is an interstitial fluorine atom. The F 3 + centers are formed both by merging F 2 + and F 1 centers and as a result of addition of vacancies to F 2 centers. In this case, vacancies are used that are generated not only during irradiation of the crystal but also in the post-radiation period. The rise in the concentration of F 3 + centers occurs faster than the rise in the concentration of F 2 centers.Introduction. Lithium fluoride crystals (LiF) with radiation-induced color centers are widely used and studied. These crystals, pure [1] and with impurities [2], are well known materials for ionizing radiation dosimetry. Lithium fluoride with color centers is used as an active medium with broadband gain in solid-state lasers in the visible and near-IR ranges of the spectrum [3]. The problems of miniaturization of components based on it and design of structures with high spatial resolution [4][5][6][7] have been studied. New detectors have been proposed in the form of microcrystalline lithium fluoride in a polymer matrix for determining high doses of gamma photons and electrons [8], and also polycrystalline LiF films as neutron sensors [9]. Polycrystalline lithium fluoride (LiF ceramic) has been created [10] and the possibilities for its use have been intensively studied. Applications of lithium fluoride with color centers require targeted variation and optimization of its properties and characteristics. In order to solve these problems, we need to know as much detail as possible about the color center formation processes.Processes involved in formation of radiation-induced color centers in lithium fluoride have been studied for many years [11][12][13][14][15][16]. It has been found that the kinetics and results of coloring LiF depend on a number of factors: the type of ionizing radiation, the irradiation dose and irradiation conditions, the ...

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“…For analysis of the experimental data, we need to model the color center aggregation processes. In [18], it is shown that the change over time t in the vacancy concentration n v in the initial stage of annealing can be represented in the form:…”

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Aggregate color center formation processes in lithium fluoride crystals after irradiation

et al. 2011

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Lifetimes of anion vacancies and F 2 + color centers in lithium fluoride following irradiation

Cited by 1 publication

References 7 publications

Aggregate color center formation processes in lithium fluoride crystals after irradiation

Aggregate color center formation processes in lithium fluoride crystals after irradiation

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